2009/12/10 by Yi-Zhong Fan, Fan, Yi-Zhong
Physics and Astronomy · #Afterglow #Astronomy #Astrophysics #Breakout #Fermi Gamma-ray Space Telescope #Gamma-ray burst #Gamma-ray bursts and supernovae #Nuclear physics #Photosphere #Physics #Radiation #Spectral line #Synchrotron radiation #astro-ph.CO
paper · pdf · doi:10.48550/arxiv.0912.1887
published in arXiv (Cornell University) (Cornell University) · 8 pages including 1 figure and 1 table, to appear in the Proceedings of "The Shocking Universe. Gamma-ray Bursts and High Energy Shock Phenomena". Venice, 14-18 September 2009
openalex publication_date 2009/12/10 · arxiv created 2010/03/15 · arxiv updated 2010/03/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
The high energy emission from Gamma-ray Bursts has some interesting features, including the absence of the GeV excess in the prompt spectrum, the delayed onset of the GeV emission, and the longer duration of the GeV emission than the prompt soft gamma-ray emission. We suggest that the non-detection of a GeV excess in most GRB spectrum may favor the magnetic fireball model and the early prompt emission may be dominated by the photosphere radiation of the breakout material and is thus very soft. The synchrotron radiation in GeV band can be the dominant component of the high energy afterglow emission, as speculated in GRB 080319B and then confirmed in GRB 080916C and GRB 090510. A simple estimate of the thermal radiation of the breakout material has been presented.